diff --git a/deepmd/utils/data_system.py b/deepmd/utils/data_system.py
index a3782a906e..88578749f2 100644
--- a/deepmd/utils/data_system.py
+++ b/deepmd/utils/data_system.py
@@ -496,17 +496,18 @@ def _process_sys_probs(self, sys_probs) :
         sys_probs = np.array(sys_probs)
         type_filter = sys_probs >= 0
         assigned_sum_prob = np.sum(type_filter * sys_probs)
-        assert assigned_sum_prob <= 1, "the sum of assigned probability should be less than 1"
+        # 1e-8 is to handle floating point error; See #1917
+        assert assigned_sum_prob <= 1. + 1e-8, "the sum of assigned probability should be less than 1"
         rest_sum_prob = 1. - assigned_sum_prob
-        if rest_sum_prob != 0 :
+        if not np.isclose(rest_sum_prob, 0):
             rest_nbatch = (1 - type_filter) * self.nbatches
             rest_prob = rest_sum_prob * rest_nbatch / np.sum(rest_nbatch)
             ret_prob = rest_prob + type_filter * sys_probs
         else :
             ret_prob = sys_probs
-        assert np.sum(ret_prob) == 1, "sum of probs should be 1"
+        assert np.isclose(np.sum(ret_prob), 1), "sum of probs should be 1"
         return ret_prob
-    
+
     def _prob_sys_size_ext(self, keywords):
         block_str = keywords.split(';')[1:]
         block_stt = []
diff --git a/source/tests/test_deepmd_data_sys.py b/source/tests/test_deepmd_data_sys.py
index 5bab4d74e5..5582bdb4c2 100644
--- a/source/tests/test_deepmd_data_sys.py
+++ b/source/tests/test_deepmd_data_sys.py
@@ -289,4 +289,39 @@ def _in_array(self, target, idx_map, ndof, array):
         for idx,ii in enumerate(all_find) :
             self.assertTrue(ii, msg = 'does not find frame %d in array' % idx)
 
-                
+    def test_sys_prob_floating_point_error(self):
+        # test floating point error; See #1917
+        sys_probs = [
+            0.010,                                                           
+            0.010,
+            0.010,
+            0.010,
+            0.010,
+            0.010,
+            0.010,
+            0.010,
+            0.010,
+            0.150,
+            0.100,
+            0.100,
+            0.050,
+            0.050,
+            0.020,
+            0.015,
+            0.015,
+            0.050,
+            0.020,
+            0.015,
+            0.040,
+            0.055,
+            0.025,
+            0.025,
+            0.015,
+            0.025,
+            0.055,
+            0.040,
+            0.040,
+            0.005,
+            ]
+        ds = DeepmdDataSystem(self.sys_name, 3, 2, 2.0, sys_probs=sys_probs)
+        self.assertEqual(ds.sys_probs.size, len(sys_probs))